<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>标签规范</title>
    <style>
       div{
            background-color: darkorange;
        }
       div span{
            background-color: green;
        }
    </style>
</head>
<body>
    <div>heihei
        <span>heihei</span>
    </div>

    <hr>
    <span style="color: #1b6d85">heihei</span>
</body>
</html>